CVE-2026-41677: Openssl · Out-of-bounds read when a PEM password callback returns an oversized length
Affects opensslSource GCVE Database
Not known to be exploited : upgrade to 0.10.78 when convenient.
Data as of 10 Nov 2026, 14:22 UTC
Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
- Patch
- Available – fixed in 0.10.78
Exploitation evidence
Disclosed: evidence found.
CVE published 19 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 10 Nov 2026.
What to do
Upgrade openssl to 0.10.78.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
crates.ioopensslpkg:cargo/opensslOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
Upgrade OpenSSL to version 0.10.78 or later, where the issue is fixed by treating oversized callback lengths as failures. No other mitigations are indicated or necessary.
Description
A vulnerability in OpenSSL versions from 0.9.0 up to but not including 0.10.78 allows an out-of-bounds read when a PEM password callback returns a length larger than the buffer size. This occurs because the length returned by the user's password callback is not validated against the buffer size, leading to reading past the buffer end during key derivation. OpenSSL 3.x is not affected. The issue is fixed in version 0.10.78, which treats oversized lengths as callback failures.