CVE-2026-48852
CVE-2026-48852 is a low-severity vulnerability in Putty with a CVSS 3.x base score of 3.7. 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-617.
Key facts
- Severity: Low (CVSS 3.x base score 3.7)
- EPSS exploit prediction: 0% (19th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-31735
- Weakness: CWE-617
- Affected product: Putty
- Published:
- Last modified:
Description
PuTTY 0.71 before 0.84 has an assertion failure in ECDSA signature verification.
Frequently asked questions
- What is CVE-2026-48852?
- PuTTY 0.71 before 0.84 has an assertion failure in ECDSA signature verification.
- How severe is CVE-2026-48852?
- CVE-2026-48852 has a CVSS 3.x base score of 3.7, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
- Is CVE-2026-48852 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-48852?
- CVE-2026-48852 affects Putty. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-48852?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-48852 have an EU (EUVD) identifier?
- Yes. CVE-2026-48852 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31735.
- When was CVE-2026-48852 published?
- CVE-2026-48852 was published on 2026-05-25 and last updated on 2026-06-17.
References
- https://lists.tartarus.org/pipermail/putty-announce/2026/000042.html
- https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/ecdsa-remotely-triggerable-assertion.html
Affected products (1)
- cpe:2.3:a:putty:putty:*:*:*:*:*:*:*:*
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