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Fencer Vulns
critical 9.1

CVE-2026-41677 json

rust-openssl: Out-of-bounds read in PEM password callback when user callback returns an oversized length

published 2026-04-22 6 mo ago modified 2026-09-10 1 mo ago also GHSA-xmgf-hq76-4vx2 , EUVD-2026-25583

cvss
9.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 22%
public exploits
0
none known

Summary

rust-openssl provides OpenSSL bindings for the Rust programming language. From 0.9.0 to before 0.10.78, the *_from_pem_callback APIs did not validate the length returned by the user's callback. A password callback that returns a value larger than the buffer it was given can cause some versions of OpenSSL to over-read this buffer. OpenSSL 3.x is not affected by this. This vulnerability is fixed in 0.10.78.

Patch / fix

  • crates.io openssl 0.10.78
  • rust-openssl_project rust-openssl 0.10.78
  • rust-openssl Debian 14 0.10.78-1

debian advisories DEBIAN-CVE-2026-41677

  • rustup SLES for SAP applications 16.0, SLES 16.0 1.29.1~0-160000.1.1
  • sccache SLES for SAP applications 16.0, SLES 16.0 0.18.0~2-160000.1.1
  • snpguest SLE Module for Server Applications 15 SP7 0.10.0-150700.3.6.1
  • snphost SLES for SAP applications 16.0, SLES 16.0 0.6.0-160000.3.1
  • snphost SLE Module for Confidential Computing Technical Preview 15 SP7 0.6.1-150700.3.6.1
  • snpguest SLES for SAP applications 16.0, SLES 16.0 0.10.0-160000.2.1
  • himmelblau SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES 15 SP6-LTSS +3 more 2.3.14+git0.e23b4c54-150500.11.12.1
  • afterburn Linux Micro 6.1 5.10.0.git73.b97f772-slfo.1.1_1.1

suse advisories SUSE-SU-2026:24014-1SUSE-SU-2026:23983-1SUSE-SU-2026:3791-1SUSE-SU-2026:23327-1SUSE-SU-2026:3642-1SUSE-SU-2026:23236-1

  • rustup openSUSE Leap 16.0 1.29.1~0-160000.1.1
  • sccache openSUSE Leap 16.0 0.18.0~2-160000.1.1
  • sdbootutil openSUSE Leap 16.0 1+git20260908.c641fc2-160000.1.1
  • snpguest openSUSE Tumbleweed 0.10.0-3.1
  • snphost openSUSE Tumbleweed 0.7.0-3.1
  • snphost openSUSE Leap 16.0 0.6.0-160000.3.1
  • snpguest openSUSE Leap 16.0 0.10.0-160000.2.1
  • libkrun openSUSE Leap 16.0 1.4.10-160000.3.1

opensuse advisories openSUSE-SU-2026:22016-1openSUSE-SU-2026:21982-1openSUSE-SU-2026:21933-1openSUSE-SU-2026:11653-1openSUSE-SU-2026:11654-1openSUSE-SU-2026:21638-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-41677 updated cvss 6.1

rust-openssl: OpenSSL: rust-openssl: Information Disclosure Vulnerability in Password Callback

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
6 mo ago

Exploit prediction

0.29% chance of exploitation in the next 30 days, higher than 22% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 1.7 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:U
CNA 4.0 1.7 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/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 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Affected packages

ecosystem package affected fixed in
crates.io openssl
>=0.9.0, <0.10.78
0.10.78

Affected products

  • rust-openssl rust-openssl

Classification

Weakness
  • CWE-125 Out-of-bounds Read
  • CWE-1284 Improper Validation of Specified Quantity in Input

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.