CVE-2022-24713: Regular expression denial of service in Rust's regex crate
Noroxi assessment
Priority: Monitor (action score 34/100)
- Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
- Probability of exploitation in the next 30 days: 14.4% (FIRST EPSS); higher than 96.6% of all records.
- Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
- According to CISA the attack is automatable: targets can be found by mass scanning.
- Fixed version: firefox (AlmaLinux:8) 91.8.0-1.el8_5.alma; thunderbird (AlmaLinux:8) 91.8.0-1.el8_5.alma, 91.8.0-1.el8_5.alma.plus; regex (crates.io) 1.5.5.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to firefox (AlmaLinux:8) 91.8.0-1.el8_5.alma; thunderbird (AlmaLinux:8) 91.8.0-1.el8_5.alma, 91.8.0-1.el8_5.alma.plus; regex (crates.io) 1.5.5 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
regex is an implementation of regular expressions for the Rust language. The regex crate features built-in mitigations to prevent denial of service attacks caused by untrusted regexes, or untrusted input matched by trusted regexes. Those (tunable) mitigations already provide sane defaults to prevent attacks. This guarantee is documented and it's considered part of the crate's API. Unfortunately a bug was discovered in the mitigations designed to prevent untrusted regexes to take an arbitrary amount of time during parsing, and it's possible to craft regexes that bypass such mitigations. This makes it possible to perform denial of service attacks by sending specially crafted regexes to services accepting user-controlled, untrusted regexes. All versions of the regex crate before or equal to 1.5.4 are affected by this issue. The fix is include starting from regex 1.5.5. All users accepting user-controlled regexes are recommended to upgrade immediately to the latest version of the regex crate. Unfortunately there is no fixed set of problematic regexes, as there are practically infinite regexes that could be crafted to exploit this vulnerability. Because of this, it us not recommend to deny known problematic regexes.
- BDU:2022-02373
- GHSA-m5pq-gvj9-9vr8
- ALSA-2022:1287
- ALSA-2022:1301
- DLA-2971-1
- DLA-2978-1
- DSA-5113-1
- DSA-5118-1
- openSUSE-SU-2022:1127-1
- openSUSE-SU-2024:0294-1
- openSUSE-SU-2024:11913-1
- openSUSE-SU-2024:11914-1
- openSUSE-SU-2024:11917-1
- openSUSE-SU-2024:11918-1
- openSUSE-SU-2024:11920-1
- openSUSE-SU-2024:11921-1
- openSUSE-SU-2024:11922-1
- openSUSE-SU-2024:11923-1
- openSUSE-SU-2024:11925-1
- openSUSE-SU-2024:11928-1
- Published
- Mar 8, 2022
- Updated
- Jun 17, 2026
- EPSS
- 14.4% · 96th percentile
- CWE
- CWE-400
Report tools
Action score
34
Monitor
Low priority for now.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 4 / 30 · 14.4%
CISA SSVC decision
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 7.5
- CNA · GitHub_M
- 7.5
- agree
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- Proof of concept exists, no weaponized module
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| rust-lang | regex | cpe:2.3:a:rust-lang:regex |
| fedoraproject | fedora | cpe:2.3:o:fedoraproject:fedora |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- debian debian linux10.0
- debian debian linux11.0
- debian debian linux9.0
- fedoraproject fedora34
- fedoraproject fedora35
- fedoraproject fedora36
- rust-lang regexbefore 1.5.5
Versions reported by the vendor
Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.
rust-lang regex
- < 1.5.5affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:8 | firefox | before 91.8.0-1.el8_5.alma | 91.8.0-1.el8_5.alma |
| AlmaLinux:8 | thunderbird | before 91.8.0-1.el8_5.alma | 91.8.0-1.el8_5.alma |
| AlmaLinux:8 | thunderbird | before 91.8.0-1.el8_5.alma.plus | 91.8.0-1.el8_5.alma.plus |
| crates.io | regex | from 0.0.0-0 · before 1.5.5 | 1.5.5 |
| crates.io | regex | before 1.5.5 | 1.5.5 |
| Debian:10 | firefox-esr | before 91.8.0esr-1~deb10u1 | 91.8.0esr-1~deb10u1 |
| Debian:10 | thunderbird | before 1:91.8.0-1~deb10u1 | 1:91.8.0-1~deb10u1 |
| Debian:11 | firefox-esr | before 91.8.0esr-1~deb11u1 | 91.8.0esr-1~deb11u1 |
| Debian:11 | thunderbird | before 1:91.8.0-1~deb11u1 | 1:91.8.0-1~deb11u1 |
| Debian:12 | firefox-esr | before 91.8.0esr-1 | 91.8.0esr-1 |
| Debian:12 | rust-regex | before 1.5.5-1 | 1.5.5-1 |
| Debian:12 | thunderbird | before 1:91.8.0-1 | 1:91.8.0-1 |
| Debian:9 | firefox-esr | before 91.8.0esr-1~deb9u1 | 91.8.0esr-1~deb9u1 |
| Debian:9 | thunderbird | before 1:91.8.0-1~deb9u1 | 1:91.8.0-1~deb9u1 |
| openSUSE:Leap 15.3 | MozillaFirefox | before 91.8.0-150200.152.26.1 | 91.8.0-150200.152.26.1 |
| openSUSE:Leap 15.3 | MozillaThunderbird | before 91.8.0-150200.8.65.1 | 91.8.0-150200.8.65.1 |
| openSUSE:Leap 15.3 | rustup | before 1.25.1~0-150300.7.13.2 | 1.25.1~0-150300.7.13.2 |
| openSUSE:Leap 15.3 | sccache | before 0.3.0~git5.14a4b8b-150300.7.9.1 | 0.3.0~git5.14a4b8b-150300.7.9.1 |
| openSUSE:Leap 15.4 | aws-nitro-enclaves-cli | before 1.2.2~git0.4ccc639-150400.3.3.1 | 1.2.2~git0.4ccc639-150400.3.3.1 |
| openSUSE:Leap 15.4 | sccache | before 0.4.2~3-150400.3.3.1 | 0.4.2~3-150400.3.3.1 |
| openSUSE:Leap 15.6 | kanidm | before 1.3.3~git0.f075d13-bp156.4.1 | 1.3.3~git0.f075d13-bp156.4.1 |
| openSUSE:Tumbleweed | bat | before 0.21.0-1.1 | 0.21.0-1.1 |
| openSUSE:Tumbleweed | cargo-audit | before 0.16.0~git0.625c965-3.1 | 0.16.0~git0.625c965-3.1 |
| openSUSE:Tumbleweed | firecracker | before 1.0.0-2.1 | 1.0.0-2.1 |
+59
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| almalinux:firefox | 91.8.0-1.el8_5.alma · AlmaLinux:8 | Package registry (OSV) |
| almalinux:thunderbird | 91.8.0-1.el8_5.alma · AlmaLinux:8 | Package registry (OSV) |
| crates.io:regex | 1.5.5 | Package registry (OSV) |
| debian:firefox-esr | 91.8.0esr-1 · Debian:12 | Package registry (OSV) |
| debian:rust-regex | 1.5.5-1 · Debian:12 | Package registry (OSV) |
| debian:thunderbird | 1:91.8.0-1 · Debian:12 | Package registry (OSV) |
| opensuse:aws-nitro-enclaves-cli | 1.2.2~git0.4ccc639-150400.3.3.1 · openSUSE:Leap 15.4 | Package registry (OSV) |
| opensuse:cargo-audit | 0.16.0~git0.625c965-3.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| opensuse:juliaup | 1.5.37-2.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| opensuse:kanidm | 1.3.3~git0.f075d13-bp156.4.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| opensuse:macchina | 6.0.6~git0.c21ce78-2.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| opensuse:MozillaFirefox | 91.8.0-150200.152.26.1 · openSUSE:Leap 15.3 | Package registry (OSV) |
| opensuse:MozillaThunderbird | 91.8.0-150200.8.65.1 · openSUSE:Leap 15.3 | Package registry (OSV) |
| opensuse:rage-encryption | 0.7.1+0-2.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| opensuse:rustup | 1.25.1~0-150300.7.13.2 · openSUSE:Leap 15.3 | Package registry (OSV) |
| opensuse:sccache | 0.3.0~git5.14a4b8b-150300.7.9.1 · openSUSE:Leap 15.3 | Package registry (OSV) |
| opensuse:treefetch | 2.0.0~git0.5b3eac1-2.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| opensuse:tuigreet | 0.7.1-4.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| red hat:firefox | 0:91.8.0-1.el8_1 · Red Hat:rhel_e4s:8.1::appstream | Package registry (OSV) |
| red hat:firefox-debuginfo | 0:91.8.0-1.el8_1 · Red Hat:rhel_e4s:8.1::appstream | Package registry (OSV) |
| red hat:firefox-debugsource | 0:91.8.0-1.el8_1 · Red Hat:rhel_e4s:8.1::appstream | Package registry (OSV) |
| red hat:thunderbird | 0:91.8.0-1.el8_5 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:thunderbird-debuginfo | 0:91.8.0-1.el8_5 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:thunderbird-debugsource | 0:91.8.0-1.el8_5 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| rocky linux:firefox | 0:91.8.0-1.el8_5 · Rocky Linux:8 | Package registry (OSV) |
| rocky linux:thunderbird | 0:91.8.0-1.el8_5 · Rocky Linux:8 | Package registry (OSV) |
| suse:afterburn | 5.9.0.git21.a73f509-150300.3.5.1 · SUSE:Linux Enterprise Micro 5.2 | Package registry (OSV) |
| suse:aws-nitro-enclaves-cli | 1.2.2~git0.4ccc639-150400.3.3.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP4 | Package registry (OSV) |
| suse:kanidm | 1.3.3~git0.f075d13-bp156.4.1 · SUSE:Package Hub 15 SP6 | Package registry (OSV) |
| suse:MozillaFirefox | 91.8.0-112.98.1 · SUSE:HPE Helion OpenStack 8 | Package registry (OSV) |
+3
Exploit status
Proof of concept available
A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.
Evidence
- Proof-of-concept repository on GitHub ×1
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Proof-of-concept repository on GitHub | stars:0 | 2022-06-05 |
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
- Published
- First PoC+88 d
- TodayNov 2, 2026+1700 d
No history yet (it accumulates with the daily EPSS job).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-22-0304 · Apr 11, 2022(RedHat Güvenlik Güncellemesi)
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-400 · Uncontrolled Resource ConsumptionCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvd-primary
Root cause
Code that parses nested structures sets no depth or size limit. A small input can turn into a disproportionate processing load.
The bug in code
The whole CWE-400 classA representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.
Vulnerable
function expand(node) {
return node.children.map(expand);
}Fixed
const MAX_DEPTH = 32;
function expand(node, depth = 0) {
if (depth > MAX_DEPTH) throw new Error("too deep");
return node.children.map((c) => expand(c, depth + 1));
}Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (11 more)Show less
- github.com/rust-lang/regex/security/advisories/GHSA-m5pq-gvj9-9vr8
- groups.google.com/g/rustlang-security-announcements/c/NcNNL1Jq7Yw
- lists.debian.org/debian-lts-announce/2022/04/msg00003.html
- lists.debian.org/debian-lts-announce/2022/04/msg00009.html
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JANLZ3JXWJR7FSHE57K66UIZUIJZI67T/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/O3YB7CURSG64CIPCDPNMGPE4UU24AB6H/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PDOWTHNVGBOP2HN27PUFIGRYNSNDTYRJ/
- security.gentoo.org/glsa/202208-08
- security.gentoo.org/glsa/202208-14
- www.debian.org/security/2022/dsa-5113
- www.debian.org/security/2022/dsa-5118
Vendor advisories and official records. Exploit/PoC links are deliberately left out.