How severe is CVE-2026-32877?

CVE-2026-32877 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability high.

Is CVE-2026-32877 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-32877?

CVE-2026-32877 affects Botan Project Botan. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-32877?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-32877 have an EU (EUVD) identifier?

Yes. CVE-2026-32877 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17210.

When was CVE-2026-32877 published?

CVE-2026-32877 was published on 2026-03-30 and last updated on 2026-06-17.

CVE-2026-32877

CVE-2026-32877 is a high-severity vulnerability in Botan Project Botan with a CVSS 3.x base score of 8.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: High (CVSS 3.x base score 8.2)
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17210
Weakness: CWE-125
Affected product: Botan Project Botan
Published: 2026-03-30
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-32877?: 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.
How severe is CVE-2026-32877?: CVE-2026-32877 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability high.
Is CVE-2026-32877 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-32877?: CVE-2026-32877 affects Botan Project Botan. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-32877?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-32877 have an EU (EUVD) identifier?: Yes. CVE-2026-32877 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17210.
When was CVE-2026-32877 published?: CVE-2026-32877 was published on 2026-03-30 and last updated on 2026-06-17.

References

https://github.com/randombit/botan/security/advisories/GHSA-7jj6-4r42-w9h6

Affected products (1)

cpe:2.3:a:botan_project:botan:*:*:*:*:*:*:*:*

More vulnerabilities in Botan Project Botan

CVE-2021-24115 — Critical (CVSS 9.8): In Botan before 2.17.3, constant-time computations are not used for certain decoding and encoding operations (base32,…
CVE-2018-9127 — Critical (CVSS 9.8): Botan 2.2.0 - 2.4.0 (fixed in 2.5.0) improperly handled wildcard certificates and could accept certain certificates as…
CVE-2016-6878 — Critical (CVSS 9.8): The Curve25519 code in botan before 1.11.31, on systems without a native 128-bit integer type, might allow attackers to…
CVE-2015-7826 — Critical (CVSS 9.8): botan 1.11.x before 1.11.22 improperly handles wildcard matching against hostnames, which might allow remote attackers…
CVE-2016-9132 — Critical (CVSS 9.8): In Botan 1.8.0 through 1.11.33, when decoding BER data an integer overflow could occur, which would cause an incorrect…
CVE-2016-2196 — Critical (CVSS 9.8): Heap-based buffer overflow in the P-521 reduction function in Botan 1.11.x before 1.11.27 allows remote attackers to…

All CVEs affecting Botan Project Botan →

Other CWE-125 (Out-of-bounds Read) vulnerabilities

CVE-2026-24826 — Critical (CVSS 10.0): Out-of-bounds Write, Divide By Zero, NULL Pointer Dereference, Use of Uninitialized Resource, Out-of-bounds Read,…
CVE-2024-22004 — Critical (CVSS 10.0): Due to length check, an attacker with privilege access on a Linux Nonsecure operating system can trigger a…
CVE-2021-41556 — Critical (CVSS 10.0): sqclass.cpp in Squirrel through 2.2.5 and 3.x through 3.1 allows an out-of-bounds read (in the core interpreter) that…
CVE-2021-21777 — Critical (CVSS 10.0): An information disclosure vulnerability exists in the Ethernet/IP UDP handler functionality of EIP Stack Group OpENer…
CVE-2017-14451 — Critical (CVSS 10.0): An exploitable out-of-bounds read vulnerability exists in libevm (Ethereum Virtual Machine) of CPP-Ethereum. A…
CVE-2013-0767 — Critical (CVSS 10.0): The nsSVGPathElement::GetPathLengthScale function in Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and…

Browse all CWE-125 (Out-of-bounds Read) vulnerabilities →