8.2

CVE-2026-32877: botan_project botan Out-of-bounds Read

CVSS: 8.2v3.1HighAnalyzed
AliasesALPINE-CVE-2026-32877UBUNTU-CVE-2026-32877DEBIAN-CVE-2026-32877
Published 30-03-2026Last modified 31-03-2026
Open JSON

Vulnerability summary

CVE-2026-32877 is a high (CVSS 8.2) Out-of-bounds Read vulnerability in botan_project botan. EPSS estimates a 0.50% chance of exploitation in the next 30 days, higher than 42% of scored vulnerabilities.

Overall risk
33/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.2/10
010
High · v3.1 (CVE.org)
EPSS score
0.50%
0%100%
Low · +0.22 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 30-03-2026
    PublishedVulnerability first disclosed.
  2. 31-03-2026
    Last modifiedVulnerability information updated.

Description

Botan is a C++ cryptography library. From version 2.3.0 to before version 3.11.0, during SM2 decryption, the code that checked the authentication code value (C3) failed to check that the encoded value was of the expected length prior to comparison. An invalid ciphertext can cause a heap over-read of up to 31 bytes, resulting in a crash or potentially other undefined behavior. This issue has been patched in version 3.11.0.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.50%

Chance of exploitation in the next 30 days

Percentile

42%

Versus all other CVEs

30-day change

+0.22 pp

From 0.28% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.50%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu3 products
  • botanAll versions (No fix recorded)
  • botan1.10All versions (No fix recorded)
  • botan3All versions (No fix recorded)
Debian2 products
  • botanAll versions (No fix recorded)
  • botan3< 3.11.0+dfsg-2
Alpine1 product
  • botan3< 3.11.0-r0
Botan_project1 product
Randombit1 product

5 vendors · 8 products

References

5 links