CVE-2026-41676: rust-openssl: Deriver::derive and PkeyCtxRef::derive can overflow short buffers on OpenSSL 1.1.1
Noroxi assessment
Priority: Monitor (action score 28/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 0.28% (FIRST EPSS).
- 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: rust-openssl rust-openssl 0.10.78; cbl2 rpm-ostree 2022.1-8 on CBL-Mariner 2.0 Release Notes; cbl2 rust 1.72.0-15 on CBL-Mariner 2.0 Release Notes.
Low priority for now. Upgrade to rust-openssl rust-openssl 0.10.78; cbl2 rpm-ostree 2022.1-8 on CBL-Mariner 2.0 Release Notes; cbl2 rust 1.72.0-15 on CBL-Mariner 2.0 Release Notes 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
rust-openssl provides OpenSSL bindings for the Rust programming language. From 0.9.27 to before 0.10.78, Deriver::derive (and PkeyCtxRef::derive) sets len = buf.len() and passes it as the in/out length to EVP_PKEY_derive, relying on OpenSSL to honor it. On OpenSSL 1.1.x, X25519, X448, DH and HKDF-extract ignore the incoming *keylen, unconditionally writing the full shared secret (32/56/prime-size bytes). A caller passing a short slice gets a heap/stack overflow from safe code. OpenSSL 3.x providers do check, so this only impacts older OpenSSL. This vulnerability is fixed in 0.10.78.
- BDU:2026-14968
- GHSA-pqf5-4pqq-29f5
- openSUSE-SU-2026:11182-1
- openSUSE-SU-2026:11194-1
- openSUSE-SU-2026:11205-1
- openSUSE-SU-2026:11206-1
- openSUSE-SU-2026:11210-1
- openSUSE-SU-2026:11222-1
- openSUSE-SU-2026:11237-1
- openSUSE-SU-2026:11255-1
- openSUSE-SU-2026:21252-1
- openSUSE-SU-2026:21274-1
- openSUSE-SU-2026:21285-1
- openSUSE-SU-2026:21294-1
- openSUSE-SU-2026:21386-1
- openSUSE-SU-2026:21464-1
- openSUSE-SU-2026:21782-1
- openSUSE-SU-2026:21933-1
- openSUSE-SU-2026:21982-1
- openSUSE-SU-2026:22016-1
- Published
- Apr 24, 2026
- Updated
- Jul 15, 2026
- EPSS
- 0.2% · 21th percentile
- CWE
- CWE-131
Report tools
Action score
28
Monitor
Low priority for now.
- CVSS
- 28 / 40 · 7.2 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.2%
CISA SSVC decision
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · GitHub_M
- 7.2
- NVD has not scored this yet; the score shown is the CNA’s.
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U
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
- No public exploit code on record
- 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-openssl project | rust-openssl | cpe:2.3:a:rust-openssl_project:rust-openssl |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- rust-openssl project rust-openssl0.9.27 and later · before 0.10.78
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-openssl rust-openssl
- >= 0.9.27, < 0.10.78affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| crates.io | openssl | from 0.9.27 · before 0.10.78 | 0.10.78 |
| Debian:12 | rust-openssl | from 0 | — |
| Debian:14 | rust-openssl | before 0.10.78-1 | 0.10.78-1 |
| openSUSE:Leap 16.0 | afterburn | before 5.10.0.git73.b97f772-160000.1.1 | 5.10.0.git73.b97f772-160000.1.1 |
| openSUSE:Leap 16.0 | aws-nitro-enclaves-cli | before 1.5.0~git0.2950b36-160000.1.1 | 1.5.0~git0.2950b36-160000.1.1 |
| openSUSE:Leap 16.0 | clamav | before 1.5.3-160000.1.1 | 1.5.3-160000.1.1 |
| openSUSE:Leap 16.0 | libkrun | before 1.4.10-160000.3.1 | 1.4.10-160000.3.1 |
| openSUSE:Leap 16.0 | python-cryptography | before 44.0.3-160000.4.1 | 44.0.3-160000.4.1 |
| openSUSE:Leap 16.0 | python-maturin | before 1.8.7-160000.5.1 | 1.8.7-160000.5.1 |
| openSUSE:Leap 16.0 | rust-keylime | before 0.2.9+49-160000.1.1 | 0.2.9+49-160000.1.1 |
| openSUSE:Leap 16.0 | rustup | before 1.29.1~0-160000.1.1 | 1.29.1~0-160000.1.1 |
| openSUSE:Leap 16.0 | sccache | before 0.18.0~2-160000.1.1 | 0.18.0~2-160000.1.1 |
| openSUSE:Leap 16.0 | sdbootutil | before 1+git20260908.c641fc2-160000.1.1 | 1+git20260908.c641fc2-160000.1.1 |
| openSUSE:Tumbleweed | afterburn | before 5.10.0.git73.b97f772-1.1 | 5.10.0.git73.b97f772-1.1 |
| openSUSE:Tumbleweed | cargo-c | before 0.10.23-1.1 | 0.10.23-1.1 |
| openSUSE:Tumbleweed | clamav | before 1.5.3-1.1 | 1.5.3-1.1 |
| openSUSE:Tumbleweed | python-maturin | before 1.14.1-1.1 | 1.14.1-1.1 |
| openSUSE:Tumbleweed | rust-keylime | before 0.2.9+49-1.1 | 0.2.9+49-1.1 |
| openSUSE:Tumbleweed | rustup | before 1.28.2~0-4.1 | 1.28.2~0-4.1 |
| openSUSE:Tumbleweed | sccache | before 0.16.0~0-2.1 | 0.16.0~0-2.1 |
| openSUSE:Tumbleweed | sdbootutil | before 1+git20260706.f9f4faf-1.1 | 1+git20260706.f9f4faf-1.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | clamav | before 1.5.3-150400.13.8.1 | 1.5.3-150400.13.8.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | rustup | before 1.28.2~0-150400.3.13.1 | 1.28.2~0-150400.3.13.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | himmelblau | before 2.3.14+git0.e23b4c54-150500.11.12.1 | 2.3.14+git0.e23b4c54-150500.11.12.1 |
+34
Same product
rust-openssl project: all recordsOther highest-scoring records for the same primary product.
- CVE-2018-20997An issue was discovered in the openssl crate before 0.10.9 for Rust.40Plan
- CVE-2026-41898rust-openssl: Unchecked callback-returned length in PSK and cookie generate trampolines can cause OpenSSL to leak adjacent memory to the network peer33Monitor
- CVE-2026-41681rust-openssl: MdCtxRef::digest_final() writes past caller buffer with no length check32Monitor
Published before and after this one in the same product
- ← EarlierCVE-2016-10931Aug 26, 2019 · An issue was discovered in the openssl crate before 0.9.0 for Rust.32Monitor
- Later →CVE-2026-41677Apr 24, 2026 · rust-openssl: Out-of-bounds read in PEM password callback when user callback returns an oversized length6Monitor
- Later →CVE-2026-41678Apr 24, 2026 · rust-openssl: Incorrect bounds assertion in aes key wrap28Monitor
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 |
|---|---|---|
| rust-openssl rust-openssl | 0.10.78 · description | Vendor (CNA) |
| cbl2 rpm-ostree 2022.1-8 on CBL-Mariner 2.0 | Release Notes | Microsoft (MSRC) |
| cbl2 rust 1.72.0-15 on CBL-Mariner 2.0 | Release Notes | Microsoft (MSRC) |
| crates.io:openssl | 0.10.78 | Package registry (OSV) |
| debian:rust-openssl | 0.10.78-1 · Debian:14 | Package registry (OSV) |
| opensuse:afterburn | 5.10.0.git73.b97f772-1.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| opensuse:aws-nitro-enclaves-cli | 1.5.0~git0.2950b36-160000.1.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:cargo-c | 0.10.23-1.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| opensuse:clamav | 1.5.3-1.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| opensuse:libkrun | 1.4.10-160000.3.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:python-cryptography | 44.0.3-160000.4.1 · openSUSE:Leap 16.0 | Package registry (OSV) |
| opensuse:python-maturin | 1.14.1-1.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| opensuse:rust-keylime | 0.2.9+49-1.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| opensuse:rustup | 1.28.2~0-4.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| opensuse:sccache | 0.16.0~0-2.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| opensuse:sdbootutil | 1+git20260706.f9f4faf-1.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| suse:afterburn | 5.10.0.git73.b97f772-160000.1.1 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
| suse:aws-nitro-enclaves-cli | 1.5.0~git0.2950b36-160000.1.1 · SUSE:Linux Enterprise Server 16.0 | Package registry (OSV) |
| suse:clamav | 1.5.3-160000.1.1 · SUSE:Linux Enterprise Server 16.0 | Package registry (OSV) |
| suse:cryptsetup | 2.8.4-150700.6.4.4 · SUSE:Linux Enterprise Module for Basesystem 15 SP7 | Package registry (OSV) |
| suse:himmelblau | 2.3.14+git0.e23b4c54-150500.11.12.1 · SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | Package registry (OSV) |
| suse:libkrun | 1.4.10-2.1 · SUSE:Linux Micro 6.0 | Package registry (OSV) |
| suse:python-cryptography | 44.0.3-160000.4.1 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
| suse:python-maturin | 1.8.7-160000.5.1 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
| suse:rust-keylime | 0.2.9+49-160000.1.1 · SUSE:Linux Micro 6.2 | Package registry (OSV) |
| suse:rustup | 1.28.2~0-150400.3.13.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:rustup | 1.29.1~0-160000.1.1 · SUSE:Linux Enterprise Server 16.0 | Package registry (OSV) |
| suse:s390-tools | 2.31.0-4.1 · SUSE:Linux Micro 6.0 | Package registry (OSV) |
| suse:sccache | 0.16.0~0-150600.10.11.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP7 | Package registry (OSV) |
| suse:sccache | 0.18.0~2-160000.1.1 · SUSE:Linux Enterprise Server 16.0 | 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.
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.
No commit or PR link among the references.
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
- 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
- Integrity
- Availability
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- X
Weakness class (CWE)
CWE-131 · Incorrect Calculation of Buffer SizeCVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
nvd-secondary
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)
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Vendor advisories and official records. Exploit/PoC links are deliberately left out.