CVE-2026-71562: httpc does not bound server-supplied numeric header values before integer conversion
CSIRTS triage
- What
- httpc does not bound server-supplied numeric header values before integer conversion, leading to potential memory corruption.
- Who is affected
- Systems using Erlang/OTP httc module with servers supplying malformed numeric headers.
- Urgency
- Moderate; no current exploitation reported, but integer overflow can cause memory issues or crashes.
- Action
- Update Erlang/OTP to a patched version when available; contact Erlang/OTP maintainers for release timeline.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-71562
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-715620.34% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 27% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-71562 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
Recent advisories for httpc does not
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- unknownCVE-2026-55951: httpc memory exhaustion via unbounded response header accumulationmsrc · 2026-09-02
- unknownCVE-2026-71562: Improper Validation of Specified Quantity in Input vulnerability in Erlang/OTP inets httpc all…nvd · 2026-09-01
- unknownCVE-2026-55951: The Erlang/OTP httpc HTTP client does not enforce a limit on the total size of response header…nvd · 2026-09-01
- mediumCVE-2026-48856: httpc leaks Authorization header to cross-origin redirect targetsmsrc · 2026-06-09
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