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Update Rust crate anyhow to v1.0.103 [SECURITY] #7

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renovate wants to merge 1 commit from renovate/crate-anyhow-vulnerability into main
pull from: renovate/crate-anyhow-vulnerability
merge into: Headscracher:main
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renovate commented 2026-07-05 20:40:23 +00:00
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This PR contains the following updates:

Package Type Update Change
anyhow dependencies patch 1.0.102 → 1.0.103

Unsoundness in Error::downcast_mut()

RUSTSEC-2026-0190

More information

Details

Affected versions of this crate violate borrow rules, resulting in undefined behavior, when the user adds context to an error via Error::context and then later calls Error::downcast_mut on the returned Error.

The flaw was corrected in commit 6e8c000 by revising how the mutable reference is constructed, avoiding inclusion of a shared reference in the resulting borrow chain.

Example
use anyhow::Error;
use std::fmt;

#[derive(Debug)]
struct ErrorContext(&'static str);

impl fmt::Display for ErrorContext {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        fmt::Display::fmt(&self.0, f)
    }
}

fn main() {
    let mut error = Error::msg("inner error").context(ErrorContext("old context"));
    let context: &mut ErrorContext = error.downcast_mut().unwrap();
    context.0 = "new context";
    println!("{:?}", error);
}
Miri output
error: Undefined Behavior: trying to retag from <1538> for Unique permission at alloc602[0x38], but that tag only grants SharedReadOnly permission for this location
   --> src/ptr.rs:170:18
    |
170 |         unsafe { &mut *self.ptr.as_ptr() }
    |                  ^^^^^^^^^^^^^^^^^^^^^^^ this error occurs as part of retag at alloc602[0x38..0x48]
    |
    = help: this indicates a potential bug in the program: it performed an invalid operation, but the Stacked Borrows rules it violated are still experimental
    = help: see https://github.com/rust-lang/unsafe-code-guidelines/blob/master/wip/stacked-borrows.md for further information
help: <1538> was created by a SharedReadOnly retag at offsets [0x38..0x48]
   --> src/ptr.rs:89:18
    |
 89 |             ptr: NonNull::from(ptr),
    |                  ^^^^^^^^^^^^^^^^^^
    = note: stack backtrace:
            0: anyhow::ptr::Mut::<'_, ErrorContext>::deref_mut
                at src/ptr.rs:170:18: 170:41
            1: anyhow::error::<impl anyhow::Error>::downcast_mut::<ErrorContext>
                at src/error.rs:560:18: 560:46
            2: main
                at examples/downcast_mut.rs:15:38: 15:58

Severity

Unknown

References

This data is provided by OSV and the Rust Advisory Database (CC0 1.0).

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This PR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [anyhow](https://github.com/dtolnay/anyhow) | dependencies | patch | `1.0.102` → `1.0.103` | --- ### Unsoundness in `Error::downcast_mut()` [RUSTSEC-2026-0190](https://rustsec.org/advisories/RUSTSEC-2026-0190.html) <details> <summary>More information</summary> #### Details Affected versions of this crate violate borrow rules, resulting in undefined behavior, when the user adds context to an error via `Error::context` and then later calls `Error::downcast_mut` on the returned `Error`. The flaw was corrected in commit `6e8c000` by revising how the mutable reference is constructed, avoiding inclusion of a shared reference in the resulting borrow chain. ##### Example ```rust use anyhow::Error; use std::fmt; #[derive(Debug)] struct ErrorContext(&'static str); impl fmt::Display for ErrorContext { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { fmt::Display::fmt(&self.0, f) } } fn main() { let mut error = Error::msg("inner error").context(ErrorContext("old context")); let context: &mut ErrorContext = error.downcast_mut().unwrap(); context.0 = "new context"; println!("{:?}", error); } ``` ##### Miri output ``` error: Undefined Behavior: trying to retag from <1538> for Unique permission at alloc602[0x38], but that tag only grants SharedReadOnly permission for this location --> src/ptr.rs:170:18 | 170 | unsafe { &mut *self.ptr.as_ptr() } | ^^^^^^^^^^^^^^^^^^^^^^^ this error occurs as part of retag at alloc602[0x38..0x48] | = help: this indicates a potential bug in the program: it performed an invalid operation, but the Stacked Borrows rules it violated are still experimental = help: see https://github.com/rust-lang/unsafe-code-guidelines/blob/master/wip/stacked-borrows.md for further information help: <1538> was created by a SharedReadOnly retag at offsets [0x38..0x48] --> src/ptr.rs:89:18 | 89 | ptr: NonNull::from(ptr), | ^^^^^^^^^^^^^^^^^^ = note: stack backtrace: 0: anyhow::ptr::Mut::<'_, ErrorContext>::deref_mut at src/ptr.rs:170:18: 170:41 1: anyhow::error::<impl anyhow::Error>::downcast_mut::<ErrorContext> at src/error.rs:560:18: 560:46 2: main at examples/downcast_mut.rs:15:38: 15:58 ``` #### Severity Unknown #### References - [https://crates.io/crates/anyhow](https://crates.io/crates/anyhow) - [https://rustsec.org/advisories/RUSTSEC-2026-0190.html](https://rustsec.org/advisories/RUSTSEC-2026-0190.html) - [https://github.com/dtolnay/anyhow/issues/451](https://github.com/dtolnay/anyhow/issues/451) This data is provided by [OSV](https://osv.dev/vulnerability/RUSTSEC-2026-0190) and the [Rust Advisory Database](https://github.com/RustSec/advisory-db) ([CC0 1.0](https://github.com/rustsec/advisory-db/blob/main/LICENSE.txt)). </details> > :exclamation: **Important** > > Release Notes retrieval for this PR were skipped because no github.com credentials were available. > If you are self-hosted, please see [this instruction](https://github.com/renovatebot/renovate/blob/master/docs/usage/examples/self-hosting.md#githubcom-token-for-release-notes). --- ### Configuration 📅 **Schedule**: (in timezone UTC) - Branch creation - At any time (no schedule defined) - Automerge - At any time (no schedule defined) 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate](https://github.com/renovatebot/renovate). <!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My4yNTIuMSIsInVwZGF0ZWRJblZlciI6IjQzLjI1Mi4xIiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6WyJzZWN1cml0eSJdfQ==-->
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