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Multiple Vulnerabilities Disclosed in IMAP and Curl Libraries

Multiple Vulnerabilities Disclosed in IMAP and Curl Libraries

First seen 5 Oct 2026, 19:02 UTC • •
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ThreatCluster AI
ThreatCluster •October 5, 2026 at 19:03 UTC
  • •Multiple vulnerabilities disclosed in Curl and IMAP libraries on October 5, 2026.
  • •Issues include use-after-free, size truncation, and out-of-bounds data exposure.
  • •Potential for exploitation exists, affecting applications using these libraries.

On October 5, 2026, several vulnerabilities were disclosed affecting IMAP and Curl libraries. These include an use-after-free vulnerability in Curl's CURLOPT_REFERER, an IMAP literal size truncation issue on 32-bit platforms, and an out-of-bounds heap data disclosure in Rustls during IMAP upload cancellation. Additionally, a client-side denial of service (DoS) vulnerability was found on a password reset endpoint, and a HTML injection vulnerability in a contact form was reported, enabling phishing attacks. The vulnerabilities were reported by various researchers, including Ferdinandus Lau Tae and Mohammed K. Fathy, with submissions made on the same day. The scope of impact includes potential exploitation of these vulnerabilities in applications using these libraries, affecting user data and application stability. No specific CVEs were mentioned in the articles, and the current status of these vulnerabilities remains unclear regarding.

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Timeline

2026-10-05
Curl use-after-free vulnerability disclosed
A use-after-free vulnerability in Curl's CURLOPT_REFERER was reported, potentially leading to stale heap data exposure.
Redpacketsecurity
2026-10-05
IMAP literal size truncation vulnerability disclosed
A vulnerability affecting 32-bit platforms was reported, which could corrupt downloads and desynchronize response parsing.
Redpacketsecurity
2026-10-05
Rustls out-of-bounds data disclosure reported
An out-of-bounds heap data disclosure during IMAP upload cancellation was reported, potentially exposing sensitive data.
Redpacketsecurity
2026-10-05
Client-side DoS vulnerability disclosed
A client-side denial of service vulnerability via memory exhaustion on a password reset endpoint was reported.
Redpacketsecurity
2026-10-05
HTML injection vulnerability reported
An HTML injection vulnerability in a contact form was reported, enabling phishing attacks via legitimate infrastructure.
Redpacketsecurity

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Common questions

Are these vulnerabilities actively exploited?
The articles do not confirm any active exploitation of these vulnerabilities.
What applications are affected?
Applications using Curl and IMAP libraries on affected platforms may be vulnerable.
What should developers do?
Developers should monitor for patches and updates related to these vulnerabilities and assess their applications for potential impact.