A buffer overflow in the fribidi_get_par_embedding_levels_ex() function in lib/fribidi-bidi.c of GNU FriBidi through 1.0.7 allows an attacke
A buffer overflow in the fribidi_get_par_embedding_levels_ex() function in lib/fribidi-bidi.c of GNU FriBidi through 1.0.7 allows an attacker to cause a denial of service or possibly execute arbitrary code by delivering crafted text content to a user, when this content is then rendered by an application that uses FriBidi for text layout calculations. Examples include any GNOME or GTK+ based application that uses Pango for text layout, as this internally uses FriBidi for bidirectional text layout. For example, the attacker can construct a crafted text file to be opened in GEdit, or a crafted IRC message to be viewed in HexChat.
- Published
- Nov 13, 2019
- Updated
- Jun 16, 2026
- EPSS
- 2.2% · 82th percentile
- CWE
- CWE-120
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Report tools
Action score
32
Monitor
Low priority for now.
- CVSS
- 31 / 40 · 7.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 2.2%
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
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 linux8.0
- debian debian linux9.0
- gnu fribidi1.0.0 and later · up to 1.0.7 inclusive
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Alpine:v3.10 | fribidi | from 1.0.0 · before 1.0.5-r2 | 1.0.5-r2 |
| Alpine:v3.11 | fribidi | from 1.0.0 · before 1.0.7-r1 | 1.0.7-r1 |
| Alpine:v3.8 | fribidi | from 1.0.0 · before 1.0.2-r1 | 1.0.2-r1 |
| Alpine:v3.9 | fribidi | from 1.0.0 · before 1.0.5-r1 | 1.0.5-r1 |
| Debian:10 | fribidi | before 1.0.5-3.1+deb10u1 | 1.0.5-3.1+deb10u1 |
| Debian:12 | fribidi | before 1.0.7-1.1 | 1.0.7-1.1 |
| openSUSE:Leap 15.2 | fribidi | before 1.0.5-lp152.2.3.1 | 1.0.5-lp152.2.3.1 |
| openSUSE:Leap 15.3 | fribidi | before 1.0.5-3.3.1 | 1.0.5-3.3.1 |
| openSUSE:Tumbleweed | fribidi | before 1.0.10-2.1 | 1.0.10-2.1 |
| Red Hat:enterprise_linux:7::client | fribidi | before 0:1.0.2-1.el7_7.1 | 0:1.0.2-1.el7_7.1 |
| Red Hat:enterprise_linux:7::client | fribidi-debuginfo | before 0:1.0.2-1.el7_7.1 | 0:1.0.2-1.el7_7.1 |
| Red Hat:enterprise_linux:7::client | fribidi-devel | before 0:1.0.2-1.el7_7.1 | 0:1.0.2-1.el7_7.1 |
| Red Hat:enterprise_linux:8::appstream | fribidi | before 0:1.0.4-7.el8_1 | 0:1.0.4-7.el8_1 |
| Red Hat:enterprise_linux:8::appstream | fribidi-debuginfo | before 0:1.0.4-7.el8_1 | 0:1.0.4-7.el8_1 |
| Red Hat:enterprise_linux:8::appstream | fribidi-debugsource | before 0:1.0.4-7.el8_1 | 0:1.0.4-7.el8_1 |
| Red Hat:enterprise_linux:8::appstream | fribidi-devel | before 0:1.0.4-7.el8_1 | 0:1.0.4-7.el8_1 |
| Red Hat:rhel_e4s:8.0::appstream | fribidi | before 0:1.0.4-6.el8_0.1 | 0:1.0.4-6.el8_0.1 |
| Red Hat:rhel_e4s:8.0::appstream | fribidi-debuginfo | before 0:1.0.4-6.el8_0.1 | 0:1.0.4-6.el8_0.1 |
| Red Hat:rhel_e4s:8.0::appstream | fribidi-debugsource | before 0:1.0.4-6.el8_0.1 | 0:1.0.4-6.el8_0.1 |
| Red Hat:rhel_e4s:8.0::appstream | fribidi-devel | before 0:1.0.4-6.el8_0.1 | 0:1.0.4-6.el8_0.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP2 | fribidi | before 1.0.5-3.3.1 | 1.0.5-3.3.1 |
Same product
gnu: all recordsOther highest-scoring records for the same primary product.
- CVE-2022-25308A stack-based buffer overflow flaw was found in the Fribidi package.31Monitor
- CVE-2022-25310A segmentation fault (SEGV) flaw was found in the Fribidi package and affects the fribidi_remove_bidi_marks() function of the lib/fribidi.c 22Monitor
- CVE-2022-25309A heap-based buffer overflow flaw was found in the Fribidi package and affects the fribidi_cap_rtl_to_unicode() function of the fribidi-char22Monitor
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 |
|---|---|---|
| alpine:fribidi | 1.0.5-r2 · Alpine:v3.10 | Package registry (OSV) |
| debian:fribidi | 1.0.7-1.1 · Debian:12 | Package registry (OSV) |
| opensuse:fribidi | 1.0.5-lp152.2.3.1 · openSUSE:Leap 15.2 | Package registry (OSV) |
| red hat:fribidi | 0:1.0.2-1.el7_7.1 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:fribidi-debuginfo | 0:1.0.2-1.el7_7.1 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:fribidi-debugsource | 0:1.0.4-7.el8_1 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:fribidi-devel | 0:1.0.2-1.el7_7.1 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| suse:fribidi | 1.0.5-3.3.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP2 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
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.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
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).
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- No account or password is required.
- A user must open a link or visit a page.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-120 · Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
nvd-primary
Root cause
When data is copied, the source length is not compared with the size of the destination buffer. Excess data overwrites adjacent memory.
The bug in code
The whole CWE-120 classA representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.
Vulnerable
char buf[256];memcpy(buf, pkt->data, pkt->len);Fixed
char buf[256];if (pkt->len > sizeof(buf)) { return -EINVAL;}memcpy(buf, pkt->data, pkt->len);Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Buffer Overflow via Environment VariablesCAPEC-10likelihood: High · High
- Overflow BuffersCAPEC-100likelihood: High · Very High
- Client-side Injection-induced Buffer OverflowCAPEC-14likelihood: Medium · High
- Filter Failure through Buffer OverflowCAPEC-24likelihood: High · High
- MIME ConversionCAPEC-42likelihood: High · High
- Overflow Binary Resource FileCAPEC-44likelihood: High · Very High
- Buffer Overflow via Symbolic LinksCAPEC-45likelihood: High · High
- Overflow Variables and TagsCAPEC-46likelihood: High · High
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- access.redhat.com/errata/RHSA-2019:4326
- access.redhat.com/errata/RHSA-2019:4361
- access.redhat.com/errata/RHSA-2020:0291
- bugs.debian.org/cgi-bin/bugreport.cgi?bug=944327
- github.com/fribidi/fribidi/commit/034c6e9a1d296286305f4cfd1e0072b879f52568
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TFS3N6KKXPI6ATDNEUFRSLX7R6BOBNIP/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/W5UJRTG32FDNI7T637Q6PZYL3UCRR5HR/
- marc.info/?l=oss-security&m=157322128105807&w=2
- security-tracker.debian.org/tracker/CVE-2019-18397
- security.gentoo.org/glsa/202003-41
Vendor advisories and official records. Exploit/PoC links are deliberately left out.